Did You Know...
...that Robert Adler has the dubious distinction of being the Father of the Couch Potato? Back in 1955 Adler was employed by what was then Zenith Radio Corp., where he was charged to invent something that would allow viewers to turn down the TV volume without leaving their chairs. After a series of flops (such as a wired contraption that people tripped over), Adler hit on the idea of using sound waves. Thus the Remote Control was born...
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| Number | Title | Issue Date |
| 8149073 | Band-pass filter and method for making photonic crystal for the band-pass filter A band-pass filter includes a photonic crystal having a local mode that generates a pass band in a stop band formed by Bragg reflection, a transmission channel that limits electromagnetic waves propagating in the photonic crystal to a mode in which an amplitude dire... | 04/03/2012 |
| 7728701 | Waveguide-based MEMS tunable filters and phase shifters An actively tunable waveguide-based iris filter having a first part including a first portion of a deformable iris filter cavity having an inlet and an outlet; a second part operatively coupled with the first part and including a second portion of the deformable iri... | 06/01/2010 |
| 7456711 | Tunable cavity filters using electronically connectable pieces An apparatus and a method are provided for electronically tuning cavity filters. A tunable cavity comprises at least two pieces of material, such as metal plates or metal traces, and MEMS circuitry interconnecting the pieces of material. Multiple tunable cavities ca... | 11/25/2008 |
| 7365618 | High-frequency circuit device, high-frequency module, and communication apparatus A high-frequency circuit device, a high-frequency module, and a communication apparatus, which prevent generation of an undesired wave to prevent electrical power loss and undesired coupling, are provided. The high-frequency circuit device includes a first slot line... | 04/29/2008 |
| 7358834 | Transmission line voltage controlled nonlinear signal processors Waveguide nonlinear signal processors include transmission lines defined on a substrate. A plurality of varactors or pairs of varactors are situated along the transmission line and are in communication with a signal conductor of the transmission line and one or more... | 04/15/2008 |
| 7352264 | Electronically tunable dielectric resonator circuits In order to permit electronic tuning of the frequency of a circuit including dielectric resonators, such as a dielectric resonator filter, tuning plates are employed adjacent the individual dielectric resonators. The tuning plates comprises two separate conductive p... | 04/01/2008 |
| 7352263 | Method and mechanism for tuning dielectric resonator circuits The invention comprises a technique and associated mechanisms by which dielectric resonator circuits, such as filters, can be tuned in both frequency, bandwidth or both without the need for irises, tuning screws and/or tuning plates. In accordance with the invention... | 04/01/2008 |
| 7299534 | Method of fabrication of low-loss filter and frequency multiplexer A method of fabricating a waveguide filter includes forming a monolithic polymeric dielectric core configured for fabricating a dielectric-filled cavity, where the core includes a plurality of spaced-apart depressions; applying a layer of conducting metal to an oute... | 11/27/2007 |
| 7292123 | Waveguide E-plane RF bandpass filter with pseudo-elliptic response The invention relates to RF bandpass filters with pseudo-elliptic response. In a filter comprising a dielectric substrate placed in E position in a rectangular waveguide and comprising inserts on one of the surfaces of the substrate are placed conductors linked elec... | 11/06/2007 |
| 7288944 | Evanescent waveguide apparatus and method for measurement of dielectric constant A dielectric constant waveguide measuring apparatus preferably comprises a rectangular waveguide aperture on each end with a width a and height b. The waveguide frame is preferably split to permit the waveguide to be opened for insertion of the unknown material into... | 10/30/2007 |
| 7283022 | Dual mode ceramic filter A dual mode ceramic filter has an enclosure with two cavities separated by a wall, and two TM dual-mode resonators, each TM dual-mode resonator positioned in a corresponding cavity. Each TM dual-mode resonator has first and second modes, and a body having a central ... | 10/16/2007 |
| 7271687 | Dielectric resonator having a non-uniform effective dielectric permittivity along an axis of tuner displacement The present invention relates to an improved tuning arrangement to linearise the sensitivity to frequency changes within a certain frequency range in response to tuner displacements relative to a resonator body. The tuning arrangement comprises a tuner and/or resona... | 09/18/2007 |
| 7250835 | Waveguide band-stop filter A filter includes a waveguide with at least one impedance structure with a resonant frequency. The impedance structure is positioned in the waveguide to reflect signals at the resonant frequency. The filter can be tunable by including variable capacitance devices in... | 07/31/2007 |
| 7183881 | Cross-coupled dielectric resonator circuit A cross-coupled dielectric resonator circuit. Resonator circuits in accordance with the invention may be used to build low-loss compact filters, oscillators, and other circuits, particularly microwave circuits. The resonators are arranged relatively to each other wi... | 02/27/2007 |
| 7170373 | Dielectric waveguide filter A conductive layer is formed on each of the upper and lower surfaces of a dielectric substrate, and the two conductive layers are connected by rows of via-holes that are formed which a spacing that is less than or equal to ½ of the wavelength in the dielectric subs... | 01/30/2007 |
| 7161344 | Method and structure for variable pitch microwave probe assembly A coplanar waveguide (CPW) probe includes at least one center probe element, each having a respective center probe contact point and at least one peripheral probe element, each having a respective peripheral contact point. The pitch between the at least one center c... | 01/09/2007 |
| 7155089 | Wide-band fiber-optic tunable filter A wide-band fiber-optic tunable filter is provided. Dispersive polymers with different dispersion characteristics and side-polished fibers are used to fabricate wide-band tunable band-pass filters, band-rejection filters, short-wavelength-pass filters or long-wavele... | 12/26/2006 |
| 7145297 | L-band inductive output tube An inductive output tube (IOT) operates in a frequency range above 1000 MHz. An output window may be provided to separate a vacuum portion of the IOT from an atmospheric pressure portion of the IOT, the output window being surrounded by a cooling air manifold, the m... | 12/05/2006 |
| 7138891 | Dielectric resonator device, dielectric filter, composite dielectric filter, and communication apparatus In a dielectric resonator device, the outer shape of a support base is larger than the bottom surface of a dielectric core which is in contact with the support base, and the support base is fixed on the inner bottom surface of the cavity with support columns at the ... | 11/21/2006 |
| 7088203 | Slotted dielectric resonators and circuits with slotted dielectric resonators In accordance with the principles of the present invention, a resonator puck is provided with one or more vertical and/or horizontal, radial slits that improve the quality factor, Q, of circuits constructed from the resonators. Preferably, the slits are very narrow ... | 08/08/2006 |
| 7068127 | Tunable triple-mode mono-block filter assembly The present invention incorporates triple-mode, mono-block resonators that are tunable. Four novel and unobvious methods of tuning are disclosed. The first tuning method is to mechanically grind areas on three orthogonal faces of the mono-block in order to change th... | 06/27/2006 |
| 7068129 | Tunable waveguide filter A tunable filter includes a waveguide with at least one resonant cavity and a tunable impedance structure coupled to each resonant cavity. Each resonant cavity has a resonant frequency and its corresponding impedance structure can be tuned to adjust the resonant fre... | 06/27/2006 |
| 7057482 | Electromagnetic filter assemblies An electromagnetic filter assembly includes complimentary first and second blocks (1) and (2) defining two conjoined sections (10), (11) of an electromagnetic waveguide duct. A shim-like electromagnetic filter element (3) is held b... | 06/06/2006 |
| 7057480 | Cross-coupled dielectric resonator circuit A cross-coupled dielectric resonator circuit. Resonator circuits in accordance with the invention may be used to build low-loss compact filters, oscillators, and other circuits, particularly microwave circuits. The resonators are arranged relatively to each other wi... | 06/06/2006 |
| 7046105 | System and method for threaded plunger assembly A system and method for a plunger assembly includes a tuning slug with a bore in the stem, a tuning screw rotatably disposed in the stem, and a coupling assembly to rotatably secure the tuning screw to the slug. The system and method may also include a locking assem... | 05/16/2006 |
| 7042314 | Dielectric mono-block triple-mode microwave delay filter A delay filter uses the dielectric mono-block triple-mode resonator and unique inter-resonator coupling structure, having smaller volume and higher power handling capacity. The triple-mode mono-block resonator has three resonators in one block. An input/output probe... | 05/09/2006 |
| 7042316 | Waveguide dielectric resonator electrically tunable filter A tunable filter which may include at least one resonator. The at least one resonator may comprise a ring resonator made on a dielectric substrate placed in a waveguide, wherein the waveguide may contain a cut-off portion which houses and shields at least one resona... | 05/09/2006 |
| 7030719 | Method for tuning the center frequency of embedded microwave filters A method of tuning the frequency response of filters embedded in or formed on a ceramic substrate, such as but not limited to a low temperature co-fired ceramic substrate (LTCC), by re-firing a previously fired LTCC substrate to a temperature which is greater by a p... | 04/18/2006 |
| 7023293 | Method for tuning a radio filter, a radio filter and a system comprising such a radio filter The present invention relates to a method for tuning a radio filter. The filter comprises an input connection, an output connection and at least two resonator modules coupled in cascade, each having a tuning mechanism and a probe. A first resonator module is connect... | 04/04/2006 |
| 7012488 | Cavity resonator having an adjustable resonance frequency The aim of the invention is to provide a cavity resonator that has a great variable frequency area of a resonance frequency and is provided with good quality. Such a cavity resonator is provided with a round cross-section. The H11n in wave mode acting as the resonan... | 03/14/2006 |
| 6985047 | Continuously tunable waveguide attenuator A continuously variable waveguide attenuator (100). The continuously variable waveguide attenuator includes at least one waveguide attenuator cavity (109) having at least one barrier. A fluid dielectric (108) having a loss tangent, a permittivit... | 01/10/2006 |
| 6982615 | System and method for threaded plunger assembly A system and method for a plunger assembly includes a tuning slug with a bore in the stem, a tuning screw rotatably disposed in the stem, and a coupling assembly to rotatably secure the tuning screw to the slug. The system and method may also include a locking assem... | 01/03/2006 |
| 6975187 | Continuously tunable waveguide filter A continuously variable waveguide filter (100). The variable waveguide filter can include at least one waveguide filter cavity (154, 156, 158) and a fluid dielectric (108) having a permittivity and a permeability at least partially disposed with... | 12/13/2005 |
| 6975188 | Variable waveguide A variable waveguide system (100). The variable waveguide system (100) includes a waveguide (102), a dielectric structure (116) including at least one cavity disposed within the waveguide, and a conductive fluid (126). The cavity i... | 12/13/2005 |
| 6972648 | Broadband coaxial transmission line using uniformly distributed uniform mismatches A coaxial transmission line having intermediary segments of equal lengths and equidistant insulator supports is provided. The transmission line segment and insulator support spacing is designed to cause any reflection artifacts to occur outside or between desired ch... | 12/06/2005 |
| 6960965 | Transverse mode control in a waveguide A waveguide apparatus (100) includes a waveguide attenuator portion (102) having at least one waveguide cavity (109) and a conductive fluid (108) at least partially disposed within a waveguide cavity (104). At least one composition... | 11/01/2005 |
| 6952146 | Variable fluidic waveguide attenuator A waveguide attenuator apparatus (100) includes a variable waveguide attenuator (102) having at least one waveguide attenuator cavity (109) and a fluidic dielectric (108) having a loss tangent, a permittivity and a permeability at least p... | 10/04/2005 |
| 6952145 | Transverse mode control in a transmission line A waveguide apparatus (100) and method (300) of mode control can include a waveguide structure (102) defining at least one cavity (116) disposed within the waveguide apparatus. The waveguide apparatus has at least a first operational stat... | 10/04/2005 |
| 6936559 | Tunable devices incorporating cacu3ti4o12 This invention provides tunable devices incorporating the dielectric CaCu3Ti4O12. CaCu3Ti4O12 is especially useful in tunable devices such as phase shifters, matching networks, oscillators, filters, r... | 08/30/2005 |
| 6933811 | Resonator and high-frequency filter The resonator of the present invention includes a cylindrical dielectric and a conductor film covering the surface of the dielectric in close contact therewith. The conductor film is constructed of a cylindrical portion and two flat portions, and is formed by subjec... | 08/23/2005 |
